问题

I into robots and used to make mobile phones as well as help with medical operations

A:have put
B:have been put
C:had put
D:had been put

正确答案是：

同类题型

Much to my anger，my secretary has left me and hisown company.

I told him not to play football in the street.— ________. But he turned a deaf ear to me.

A computer can only do you have instructed it to do.

下列语句中加点字的意义和用法相同的一项是(　　)

The letter w_________ it.